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Stockholders' Equity (Tables) | 6 Months Ended
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Jun. 30, 2018
Preferred Stock |
Class of Stock [Line Items] |
Schedule of Dividends Declared | The following table presents the relevant dates with respect to such quarterly cash dividends on the Series B Preferred Stock and Series C Preferred Stock commencing January 1, 2017 through June 30, 2018 and on the Series D Preferred Stock from its time of original issuance through June 30, 2018:
|  |  |  |  |  | Cash Dividend Per Share |
Declaration Date |  | Record Date |  | Payment Date |  | Series B Preferred Stock |  | Series C Preferred Stock |  | Series D Preferred Stock |
June 18, 2018 |  | July 1, 2018 |  | July 15, 2018 |  | $ | 0.484375 |  |  | $ | 0.4921875 |  |  | $ | 0.50 |  |
March 19, 2018 |  | April 1, 2018 |  | April 15, 2018 |  | 0.484375 |  |  | 0.4921875 |  |  | 0.50 |  |
December 7, 2017 |  | January 1, 2018 |  | January 15, 2018 |  | 0.484375 |  |  | 0.4921875 |  |  | 0.51111 |  | (1)
September 14, 2017 |  | October 1, 2017 |  | October 15, 2017 |  | 0.484375 |  |  | 0.4921875 |  |  | — |
June 14, 2017 |  | July 1, 2017 |  | July 15, 2017 |  | 0.484375 |  |  | 0.4921875 |  |  | — |
March 16, 2017 |  | April 1, 2017 |  | April 15, 2017 |  | 0.484375 |  |  | 0.4921875 |  |  | — |
(1) | Cash dividend for the partial quarterly period that began on October 13, 2017 and ended on January 14, 2018.
Common Stock |
Class of Stock [Line Items] |
Schedule of Dividends Declared | The following table presents cash dividends declared by the Company on its common stock with respect to each of the quarterly periods commencing January 1, 2017 and ended June 30, 2018:
Period |  | Declaration Date |  | Record Date |  | Payment Date |  | Cash Dividend Per Share
Second Quarter 2018 |  | June 18, 2018 |  | June 28, 2018 |  | July 26, 2018 |  | $ | 0.20 |
First Quarter 2018 |  | March 19, 2018 |  | March 29, 2018 |  | April 26, 2018 |  | 0.20 |
Fourth Quarter 2017 |  | December 7, 2017 |  | December 18, 2017 |  | January 25, 2018 |  | 0.20 |
Third Quarter 2017 |  | September 14, 2017 |  | September 25, 2017 |  | October 25, 2017 |  | 0.20 |
Second Quarter 2017 |  | June 14, 2017 |  | June 26, 2017 |  | July 25, 2017 |  | 0.20 |
First Quarter 2017 |  | March 16, 2017 |  | March 27, 2017 |  | April 25, 2017 |  | 0.20 |

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Tabular disclosure of all or some of the information related to dividends declared, but not paid, as of the financial reporting date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4304-108586 + Details
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